I have worked with online gambling. An industry where for most companies the bulk of the income comes from the addicts, not the non-problematic gamblers.
I thought I could dissociate work-for-pay from my sense of self enough for this not to matter. It's all mercenary work, right? I've never cared about most of it, right? What's the difference?
I made it about three months in that industry. The pay was great but I was hardly sleeping by the end of the first month.
I too dissociated from my work and I did it for decades. This is not a healthy thing for a human to do and there will be an emotional debt paid, at some point even if only done for weeks, or months.
I'm glad you did not last long in the industry, for your personal and our collective goods. I hope you're in a good place today.
Sadly and unfortunately, in addition to the MFH ills that I have done, I also was involved with optimization for gaming hospitality as well as systems and tools around slots optimization.
I regret my involvement here as well and am sorry I did what I did.